Pencil extension



, UNITED STATES PATENT OFFICE.

WILLIAM 1a. McILYIN, on MANCHESTER, new HAMPSHIRE;

PENCIL EXTENSION.

To all whom it may concern:

Be it known that I, WILLIAM B. MGILVIN, a citizen of the United States, residing at Manchester, county of Hillsborough, State of New Hampshire, have invented an Improvement in Pencil-Extensions, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing repre senting like parts. 7

This invention relates to improvements in pencil extensions, and the object thereof is to provide a device which may be quickly and securely applied to a short piece of pencil to enabler-the lead in the latter'to be entirely used. As the usual' pencils are seven or seven and one-half inches in length the amount of'wa'stage oftwo and one-half or three inches which occurs from the pencil being too short to be manipulated conveniently amounts to a verygreat waste, and the present invention is intended to eliminate this wastage. V c c.

I am aware that heretofore tubular sleeves ofmetal or paper and other materials of a size to fit a pencil, usually carrying a-rubber at one end have been telescopically applied .to pencils for the purpose of providing an eraser for the pencil, and also serving as an extension for a short pencil. But in the use of such devices a considerable length of the pencil is necessarily inclosed within the tubular extension, in order to provide a fairly rigid connection therewith, and of course the lead which lies in such tubular extension cannot be used and becomes wasted.

' The present invention contemplates the production of a pencil extension which may be more firmly secured to the pencil than in devices heretofore made, and which will enable the lead of the pencil to be entirely used up, the material of the extension being such that it, like the body of the pencil itself, may be sharpened upon the usual sharpener.

The preferred embodiment of the invention is shown in the accompanying drawings in which:

Figure 1 is a longitudinal median sectional view through the pencil and the ex tension.

Fig. 2 isa perspective view of a short portion of pencil pointed at 'both ends and the extension provided with a socket to receive one of the pointed ends of the pencil, and

Fig. 3 is a partial median longitudinal sectional View, showing the pencil as having Specification of Letters Patent; PatentedJune' 3,' 1919, Application filed August 7, 1918. Serial No. 248,699. I

been used up to such an extent that portion of the extension has also been reduced by the sharpening means; a

In nearly all business offices penc1l sharpeners are provlded which comprise rotating knives or grinders adapted to reduce the end of the pencilto a-conically tapered point. These pencil sharpeners, though of various make, produce about the same conical taper .upon the tubular end of the pencil. The

present invention contemplates-the use of this readily available means of producing a conical end on a pencil to provide one-portion of a joint securing the pencil toan extension which will enable the lead of. the

pencil to be entirely used, thereby saving a 7 considerableamount of lead and also economizlng the use of the cedar or. other finely body of. the pencil;

grained soft wood'which is used to form the The preferred form oflpencil extension I which isillustrated herein, comprises abody of fibrous-material, preferably of wood, which can be made of short pieces found around saw-mills and other wood-working mills',-'which otherwise would be wasted. It comprisesa cylindrical,hexagonal or octagonal body 1 of the standard diametrical size of a lead pencil having av conical socket 2 in one or both ends to receive the pointed end of a pencil which has been sharpened on the usual type of pencil sharpener.

The conicity of the socket in the extension desirably corresponds exactly to the conical taper 3 of the pencil 4 when sharpened by the usual pencil sharpener. Slight variations, however, in the taper of the socket and end of the pencil will not prevent the successful use of the device as the tapering forms of the pencil points and sockets permit them to be wedged together firmly even if the parts do not fit exactly. Usuallythe pencil extension may be forced upon the together by a suitable adhesive applied to the joint between them.

A convenient means of those firmly se curing the pencil and extension together consists in providing the socket 2' with coating 5 of adhesive preferably such a glue which will be rendered tacky by the application of moisture. When, therefore the extension is to be used in this manner the pencil may be sharpened by theusual pencil sharpener and the tapered end of the pencil moistened by the lipsthen inserted and pressed firmly into the socket 2. .The moisture'upon the end ofv the pencil will then soften the glue sufficiently to cause it to adhere firmly to the end of the pencil, for it will be observed, that the action of the knives of thesharpener in crossing the grain of wood leaves a roughened porous surface which provides a firm anchorage for the glue. The same condition, of-course, exists in the surface of the socket so that the pencil and extension will be held together practically as rigidly as if they were integral.

By reason of the fact that both the body of the pencil and the extension are of wood the'sharpening of the pencil may be continued beyond the joint so that .all of the lead can be used up. As pencil extensions of this character can beformed of practically waste materials and applied with so little effort a ver' reat savin of valuable 7 1': t3

pencil stock will result from the extensive use of this invention.

It Will be understood that the preferred embodiment of the invention disclosed herein is illustrative but not restrictive and that various modifications may be made in size,

form and construction within the meaning and scope of the following claims.

I claim:

1. A pencil extension comprising an integral piece of fibrous material, conforming in contour substantially to .the form of the lead pencil and having a smooth conical socket in 'one end tapered to receive and substantially to fit the conical end of apenoil which has been pointed upon a pencil sharpener.

2. A pencil extension comprising a piece of fibrous material, conforming in contour substantially to the form ofthe lead pencil and having-a conical socket in one end tapered to .receive and substantially to fit the conical end'of a pencil which has beenpoint- WILLIAM B. MGILVIN.

Copiesof this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

